V. V. Barinov

Using Dendrochronological Analysis for Dating Earthquake-Triggered Landslides (By the Example of SE Altai, Russia)

Paleoseismogeological investigations of the high mountain, seismically active southeastern part of the Russian Altai reveal a previously unknown complex of earthquake induced landslides. Using dendrochronological analysis of the wood penetrating injuries of trees (both dead and living ones) caused by seismically induced rockfalls allowed establishing the date of previously unknown strong medieval earthquake. This date was also confirmed by radiocarbon dating of seismically cut fossil soil overlapped by undistorted one. The specified recurrence interval of strong (М > 7) earthquakes for the SE Altai (about 400 years during the last 3,000 years) argues the high regional seismicity.

A new aspect of application of dendrochronological analysis for dating strong earthquakes of the past: A case study of the Altai Mountains

One of the main problems in seismic zoning and dis� tinguishing the territories of high seismic activity is defini� tion of the Mmax value and the recurrence period for strong events leading to large deformations in relief and affecting the economic activity. Relative to the recurrence period of strong earthquakes, the duration of instrumental observa� tions is very small; therefore, calculation of this parameter implies application of historical and archaeological data, as well as definition of the age for paleoseismodislocations found in the studied territory. The present work proposes a new method of dating the seismic events by means of the dendroseismological method and gives the first results of dendrochronological analysis to determine the age and recurrence period of strong earthquakes during the Holocene in the seismoactive Southeastern Altai Moun� tains (figure).

Extreme climatic events in the Altai Republic according to dendrochronological data

The results of dating of extreme climatic events by damage to the anatomical structure and missing tree rings of the Siberian larch in the upper forest boundary of the Altai Republic are given. An analysis of the spatial distribution of the revealed dates over seven plots (Kokcy, Chind, Ak-ha, Jelo, Tute, Tara, and Sukor) allowed us to distinguish the extreme events on interregional (1700, 1783, 1788, 1812, 1814, 1884), regional (1724, 1775, 1784, 1835, 1840, 1847, 1850, 1852, 1854, 1869, 1871, 1910, 1917, 1927, 1938, 1958, 1961), and local (1702, 1736, 1751, 1785, 1842, 1843, 1874, 1885, 1886, 1919, 2007, and 2009) scales. It was shown that the events of an interregional scale correspond with the dates of major volcanic eruptions (Grimsvotn, Lakagigar, Etna, Awu, Tambora, Soufriere St. Vinsent, Mayon, and Krakatau volcanos) and extreme climatic events, crop failures, lean years, etc., registered in historical sources.

Archaeological sites as markers of Neopleistocene-Holocene hydrological system transformation in the Kurai and Chuya basins, Southeastern Altai: Results of geomorphological and geoarchaeological studies

A.R. Agatova1, 2, R.K. Nepop1, 2, I.Y. Slyusarenko3, 4, V.S. Myglan5, and V.V. Barinov5 1Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia E-mail: agatr@mail.ru; agat@igm.nsc.ru; rnk@igm.nsc.ru 2Ural Federal University, Mira 19, Yekaterinburg, 620002, Russia 3Institute of Archaeology and Ethnography, Siberian Branch, Russian Academy of Sciences, Pr. Akademika Lavrentieva 17, Novosibirsk, 630090, Russia E-mail: slig1963@yandex.ru 4Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia 5Siberian Federal University, Pr. Svobodnyi 79, Krasnoyarsk, 660041, Russia E-mail: dend_ro@mail.ru; Nelisgar@mail.ru

Extreme climatic events in the Republic of Tuva according to tree-ring analysis

This paper presents results of the spatial distribution of anomalies (disturbances) in the anatomical structure of the annual and missing rings of Siberian larch at the upper forest line in the Republic of Tuva. The spatial analysis of tree-ring chronologies that was conducted on six sites (Mongun, Kolchan, Tan, Derzik, Kungur, and Taris) has made it possible to identify the extreme events of local (1662, 1699, 1792, 1804, 1814, 1821, 1847, 1867, and 1993), regional (1698, 1754, 1775, 1779, 1785, 1788, 1789, 1797, 1813, 1819, 1843, 1854, 1869, 1870, 1882, 1911, and 1923), and interregional (1783, 1784, 1812, and 1884) importance; the latter are in good agreement with the data on large volcanic eruptions (the Grimsvotn, Lakagigar, Soufriere St. Vincent, and Krakatau volcanoes) and data from historical sources.